The Shoe Stretcher is uni-sex and can be used in either a left or right shoe. The product comes with four corn knobs, which you can view in an image above. There are 12 holes for pressure point relief and has a threaded steel rod for reinforcement. The size corresponds with shoe size.
Disclaimer: would not use in boots, high heels, or shoes with narrow widths. Use with caution, so you do not over stretch your shoes.